java - 具有默认命名空间的 Xpath

Question

我正在尝试获取某个 XML 元素的所有值。但是，命名空间未定义。我尝试过使用 local-name() 函数，但没有任何运气。

    <?xml version="1.0" encoding="utf-8" standalone="yes"?>
        <entry xml:base="https://www.website.com" xmlns:d="http://schemas.microsoft.com/ado/2007/08/dataservices" xmlns:m="http://schemas.microsoft.com/ado/2007/08/dataservices/metadata" xmlns="http://www.w3.org/2005/Atom">
          <id>A</id>
          <title type="text"></title>
          <updated>2015-07-21T02:40:30Z</updated>
          <author>
            <name />
          </author>
          <link rel="edit" title="Application" href="A(1347)" />
          <link rel="http://schemas.microsoft.com/ado/2007/08/dataservices/related/b" type="application/atom+xml;type=feed" title="B" href="A(1347)/B" />
          <link rel="http://schemas.microsoft.com/ado/2007/08/dataservices/related/C" type="application/atom+xml;type=feed" title="C" href="A(1347)/C" />
          <link rel="http://schemas.microsoft.com/ado/2007/08/dataservices/related/D" type="application/atom+xml;type=entry" title="D" href="A(1347)/D" />
          <link rel="http://schemas.microsoft.com/ado/2007/08/dataservices/related/E" type="application/atom+xml;type=feed" title="E" href="A(1347)/E">
            <m:inline>
              <feed>
                <title type="text">E</title>
                <id>1347</id>
                <updated>2015-07-21T02:40:30Z</updated>
                <link rel="self" title="E" href="A(1347)/E" />
                <entry>
                  <id>www.website.com/</id>
                  <title type="text"></title>
                  <updated>2015-07-21T02:40:30Z</updated>
                  <author>
                    <name />
                  </author>
                  <link rel="edit" title="E" href="E(4294)" />
                  <link rel="http://schemas.microsoft.com/ado/2007/08/dataservices/related/A" type="application/atom+xml;type=entry" title="Application" href="E(4294)/A" />
                  <link rel="http://schemas.microsoft.com/ado/2007/08/dataservices/related/D" type="application/atom+xml;type=entry" title="D" href="E(4294)/D" />
                  <category term="APIModel.FileBaseDocuments" scheme="http://schemas.microsoft.com/ado/2007/08/dataservices/scheme" />
                  <content type="application/xml">
                    <m:properties>
                      <d:ID m:type="Edm.Int32">4294</d:ID>
                      <d:Type>123</d:Type>
                    </m:properties>
                  </content>
                </entry>
                 <entry>
              <id>www.website.com</id>
              <title type="text"></title>
              <updated>2015-07-21T02:40:30Z</updated>
              <author>
                <name />
              </author>
              <link rel="edit" title="E" href="E(4295)" />
              <link rel="http://schemas.microsoft.com/ado/2007/08/dataservices/related/A" type="application/atom+xml;type=entry" title="A" href="E(4295)/A" />
              <link rel="http://schemas.microsoft.com/ado/2007/08/dataservices/related/D" type="application/atom+xml;type=entry" title="D" href="E(4295)/D" />
              <category term="APIModel.FileBaseDocuments" scheme="http://schemas.microsoft.com/ado/2007/08/dataservices/scheme" />
              <content type="application/xml">
                <m:properties>
                  <d:ID m:type="Edm.Int32">4295</d:ID>
                  <d:Type>456</d:Type>
                </m:properties>
              </content>
             </entry>
           </feed>
          </m:inline>
        </link>
      </entry>

我想检索“m:properties/d:ID m:type =“Edm.Int32”(在本例中为4294)内的所有值，但我没有运气。因此对于一个文件，会有一个“feed”标签填充了多个“entry”标签。在这些标签内，将有一个我需要检索的“m:properties/d:ID m:type="Edm.Int32”。对于这种情况下正确的 xPath 有何建议？

Answer 1

与其使用 local-name() 来使用与命名空间无关的 xml，为什么不为默认命名空间注册一个命名空间，例如x 前缀为 xmlns:x="http://www.w3.org/2005/Atom"，然后你的 Xpath 将类似于:

//x:feed/x:entry/x:content/m:properties/d:ID[@m:type='Edm.Int32']

local-name() 方法更加详细:

//*[local-name()='feed']/*[local-name()='entry']/*[local-name()='content']
 /*[local-name()='properties']/*[local-name()='ID' and @m:type='Edm.Int32']

Example of both approaches here